| #include <stdint.h> |
| |
| struct Bits { |
| uint32_t : 1; |
| uint32_t b1 : 1; |
| uint32_t b2 : 2; |
| uint32_t : 2; |
| uint32_t b3 : 3; |
| // Unnamed bitfield (this will get removed). |
| uint32_t : 2; |
| uint32_t b4 __attribute__ ((aligned(16))); |
| uint32_t b5 : 5; |
| uint32_t b6 : 6; |
| uint32_t b7 : 7; |
| uint32_t four : 4; |
| }; |
| |
| struct MoreBits { |
| uint32_t a : 3; |
| uint8_t : 1; |
| uint8_t b : 1; |
| uint8_t c : 1; |
| uint8_t d : 1; |
| }; |
| struct MoreBits more_bits; |
| |
| struct ManySingleBits { |
| uint16_t b1 : 1, b2 : 1, b3 : 1, b4 : 1, b5 : 1, b6 : 1, b7 : 1, b8 : 1, |
| b9 : 1, b10 : 1, b11 : 1, b12 : 1, b13 : 1, b14 : 1, b15 : 1, b16 : 1, |
| b17 : 1; |
| }; |
| struct ManySingleBits many_single_bits; |
| |
| struct LargePackedBits { |
| uint64_t a : 36; |
| uint64_t b : 36; |
| } __attribute__((packed)); |
| |
| #pragma pack(1) |
| struct PackedBits { |
| char a; |
| uint32_t b : 5, c : 27; |
| }; |
| #pragma pack() |
| |
| int main(int argc, char const *argv[]) { |
| struct Bits bits; |
| bits.b1 = 1; |
| bits.b2 = 3; |
| bits.b3 = 7; |
| bits.b4 = 15; |
| bits.b5 = 31; |
| bits.b6 = 63; |
| bits.b7 = 127; |
| bits.four = 15; |
| |
| more_bits.a = 3; |
| more_bits.b = 0; |
| more_bits.c = 1; |
| more_bits.d = 0; |
| |
| many_single_bits.b1 = 1; |
| many_single_bits.b5 = 1; |
| many_single_bits.b7 = 1; |
| many_single_bits.b13 = 1; |
| |
| struct PackedBits packed; |
| packed.a = 'a'; |
| packed.b = 10; |
| packed.c = 0x7112233; |
| |
| struct LargePackedBits large_packed = |
| (struct LargePackedBits){0xcbbbbaaaa, 0xdffffeeee}; |
| struct LargePackedBits *large_packed_ptr = &large_packed; |
| |
| return 0; // break here |
| } |